New member dashed into tent in a tizzy (7)
I believe the answer is:
entrant
'new member' is the definition.
(I've seen this before)
'dashed into tent in a tizzy' is the wordplay.
'dashed' becomes 'ran' (I've seen this in another clue).
'into' is an insertion indicator.
'in a tizzy' indicates anagramming the letters (being in a tizzy is being confused).
'tent' anagrammed gives 'entt'.
'ran' inserted within 'entt' is 'ENTRANT'.
(Other definitions for entrant that I've seen before include "One taking part in a race or competition" , "Competitor, contestant" , "One going in for exam" , "Contestant; starter" , "New participant" .)